如何在R中按日期对数据框进行排序 [英] How to sort a data frame by date in R

问题描述

Hello
我需要按日期在R中对数据框进行排序。日期全部采用dd / mm / yyyy的形式。日期在第3列。列标题为V3。我已经看到了如何按列排序数据框，我已经看到如何将字符串转换为日期值。我不能组合这两个，以便按日期对数据框进行排序。

谢谢
John

解决方案

假设你的数据框被命名为 d ，

  d [order（as.Date（d $ V3，format =％d /％m /％Y））]] 
  pre> 
 
 
阅读我的博文，，如果没有意义，
 
Hello
I need to sort a data frame by date in R.  The dates are all in the form of  "dd/mm/yyyy". The dates are in the 3rd column.  The column header is V3.  I have seen how to sort a data frame by column and I have seen how to convert the string into a date value.  I can't combine the two in order to sort the data frame by date.

Thank you
John 
解决方案
Assuming your data frame is named d,
d[order(as.Date(d$V3, format="%d/%m/%Y")),]
Read my blog post, Sorting a data frame by the contents of a column, if that doesn't make sense.

                        
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